Which is better? SVS PC-Ultra or an SVS PB2-Plus

Hey guys I need some advice. I have a SVS 20-39PCi which I've had since Oct. 2003 and I love it. Since than the SVS bass bug bit me and now I want more! My original idea a few months back was to purchase another SVS 20-39PCi but now I decided I want even more! So I've decided to sell the PCi and purchase either a PC-Ultra or a PB2-Plus. First off are there any good threads anyone can recommend comparing the two? Honestly when is the better of the two? My thoughts are the Ultra will go lower but not sound as loud and that the PB2-Plus will sound louder but not go as low. Is my thinking true or can a PB2 go as low with calibration? I prefer lower hitting bass. I would like to get a PB2 but I have this fear that it won't hit as low. I know about the port plugs but from what I've read people prefer them without or one port pluged for 20Hz. Please help me decide.

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Ferdinand,
I too have been debating between the two as to which one I prefer. I won't be placing any orders until the end of the month or early June, but here's a thread where people helped answer some questions I had. (Hopefully I can link it correctly. Doing my homework on subs.
Hope this helps.

If you are going to upgrade, buy the Ultra and I can haul my PB2+ on over and we can compare them in your room. If, for any reason, you'd rather have the PB2+, SVS does have that nice return policy.

Personally, I think you are making the right choice, especially for your room. You'll get the better driver, plus your room is small enough that you really don't need the extra SPLs of the PB2+. Of course, it's all subjective.